Laser design

Design terms can have two different meanings. In some cases, it means a complete description of a device that includes the parts of the organizer, how they are placed on the planet and the operational parameters important. In other cases, this term refers to the process leading to such descriptions. This text explains some important points in designing laser devices such as solid-state solid-state diode blowers or similar devices, such as optical paramteric oscillators.
Specify design goals
Before designing, design goals should be carefully examined. This does not include only the main parameters of the laser’s performance, such as output power and wavelength, but also a great deal of detail in this connection:
Optimum performance; for example, on output power, power efficiency, beam quality, luminosity, phase intensity or noise, long-term stability (eg, output power or optical frequency), and time instability [1], etc.
Compressed and handy layout, easy operation (for example, simple lightning process, wavelength adjustment simply and no need to reset)
Maximum Flexibility (for example, about changing operational parameters)
Reliability, minimum maintenance requirements, simple and low cost errors, cost effective maintenance and repair
At least sensitivity to fluctuations, temperature variations, electromagnetic interference and component wear
The low cost of production, ie, the small number of pieces, the leveling and the simple test, the use of expensive, sensitive parts or pieces that are difficult to produce in any way.
Design details of a laser product have a great impact on performance, reliability, flexibility and cost of construction. In an optimal development process, it is necessary that:
Aware of all design goals.
Knowing the design features needed to achieve the goals,
And use an appropriate laser design (which requires a lot of training at the start)
It is recommended that all requirements be tailored to the intended state before any type of laser investment, because adding new features to the existing system is costly and time-consuming.
Important parts of laser design
The characteristics of laser systems designed are mainly determined by the design details, not just the pieces. Some sections are very important:
The overall design parameters, such as the length of the wrapper (which affects system compression, cook, frequency stability, etc.) and the intensity of the blow.
Choosing the perimeter environment (for example, laser crystal) and the source of the blower, choosing the appropriate geometry (for example, the shape of a ribbon or a thin disk, the tail from the side or tail from the end), the concentration of the condensation, the length of the crystal, and so on.
Blowing (for example, diode-laser lasers), which is effective in output power, slab quality, long-term stability, and easy switching of laser diodes.
An optimal laser shaving model (for example, a linear or circular laser with integrated or separate elements) and an optimized design, which affects the number of components, output power and beam quality, alignment tolerance, thermal lens sensitivity, durability and mechanical thrust. .
Selection and placement of laser mirrors and in-cavity elements for wavelength stitching, short pulse generation via locking, dispersion compensation, frequency stability, and so on.
Mechanical embedding, which is effective in mechanical stability, cooling efficiency, temperature variations and easy and safe access.
Electronic equipment, for example, to stabilize output power, control laser wavelengths, monitor the position of diodes or tailpipe temperatures, and ensure safe operation.
Suitable documentation, including a list of parts (along with vendors), mechanical design, adjustment and testing steps, design ideas, possible developmental options, and limitations to improve operational parameters.
This list, which is still not complete, shows that correct laser design is not a coherent subject, and is essential for customer satisfaction, cost efficiency, and flexibility for future developments.
What is needed for laser design?
Laser design is a challenging process. The following are definitely needed:
Knowing the details of the equipment, which includes knowing the applications
Knowing the details of related physical effects, such as laser reinforcement, thermal lens, eyelashes, laser noise, etc., and their interactions.
Required data; for example, laser crystals
The ability to reduce complexity to a practical level without losing detail
Flexible software for calculations and simulations
Practical experience with laser, which enables a person to recognize problems and describe empirical observations.
It’s clear that the software alone is not enough to design a good laser.

The role of design in the development project
Empirically and not as a general suggestion, laser design can be considered as a result of the development process, which is based on trial and error. In this context, design is often not properly documented, which puts the risk of losing a lot of valuable data while saving a small amount at a time.
In each basic design project – and laser design projects are rarely coherent – it is proposed to give a fundamental role in laser design:
Laser design should be done in the office and not in the laboratory, and be associated with all relevant copies. Although this process is much faster and cheaper than the process of trial and error in the laboratory, it requires discipline and, of course, application.
A proper design is not just a set of ideas, but a comprehensive description that includes, for example, the list of required components and their full description of the layout, which is complete with a complete description of the reasons and limitations.
Then the laboratory sample is designed according to the design and not vice versa. This increases the speed of production and is made use of the expensive resources of the laboratory.
For the development of similar examples, careful design is a valuable input. If this does not exist or does not leave the company effective, then future developments are not as effective as before.
Trying to summarize these steps will reduce the credibility of the operation and prolong the process, due to unplanned technical problems. The more problems these problems are known and resolved, the more damage it has suffered.
Inference from previous design drawings
In industrial development, it is common for designing some products to be used from previous designs, rather than designing from the beginning. Although this seems to be costly, it does have a lot of risk, especially if the design is not well done and the documentation is not done in the way described above. The major challenge is that minor corrections in laser design have unwanted side effects, which in turn create new problems, and they in turn require a new cookie that has side effects again.
For these reasons, starting with a basic design, which can be implemented, is even more beneficial, even with less desirable power; it is still necessary to know the limitations and limitations. To design a family of designs, a prerequisite design is sufficient, which can be different in output power or repeat rate of pulse.
A review of the design
In certain circumstances, a review of the laser design is required. This can be the case, for example, when a serious problem has occurred or needs have been increased and a corrective design is required. If there is no proper documented design, then it is time to do this. This process will help at the same time to complete development.